Subtract the Polynomials $$\left( 3 x ^ { 6 } - 15 x ^ { 3 } - 11 \right) - \left( 9 x ^ { 6 } - 20 x ^ { 3 } + 3 \right)$$

Subtract the polynomials. Assume all variable exponents represent whole numbers.
- $$\left( 3 x ^ { 6 } - 15 x ^ { 3 } - 11 \right) - \left( 9 x ^ { 6 } - 20 x ^ { 3 } + 3 \right)$$

A) $- 6 x ^ { 6 } + 5 x ^ { 3 } - 14$
B) $- 15 x ^ { 9 }$
C) $- 6 x ^ { 6 } + 5 x ^ { 3 } - 8$
D) $- 6 x ^ { 6 } - 6 x ^ { 3 } - 8$

Correct Answer:

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